About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Equipment, Instrumentation and In-Situ Process Monitoring
|
| Presentation Title |
Hybrid Feedforward-Feedback Process Control of Laser Powder Bed Fusion |
| Author(s) |
Prahalada K. Rao, Kaustubh Deshmukh, Mihir Darji, Yash Parikh |
| On-Site Speaker (Planned) |
Prahalada K. Rao |
| Abstract Scope |
The objective is to develop and implement a multi-scale, dual-mode hybrid feedforward–feedback control approach to modulate the spatiotemporal temperature distribution (thermal history) in LPBF-processed components. Existing control approaches in LPBF are inherently limited because they focus on one process scale and employ a single control mode. For example, model-guided feedforward control is typically used to correct deleterious part-scale thermal fields before manufacturing. Likewise, real-time feedback control has been implemented to correct meltpool-scale temperature variations. Feedforward control cannot compensate for stochastic disturbances, while feedback control lacks predictive capability and suffers from response latency. The hybrid process control approach implemented in this paper integrates a priori model-based feedforward control of part-scale thermal history with real-time feedback control meltpool intensity. It is employed herein for LPBF of Inconel 718 parts. Compared to purely feedback or feedforward control, hybrid control significantly reduces distortion and mitigates within-part variation in surface finish and grain structure. |
